Electrical extension



Nov. 14, 1944. H, HARTMANN ELECTRICAL EXTENSION Filed Feb. 6, 1943 In denor: .fifa-127g fzrman-n Patented Nov. 14, 1944 UNITED STATES PATENT`O-Ffl'lCl.

ELECTRICAL EXTENSION Henry Hartmann, Chicago, Ill.

Application- February 6, 1943,y Serial No. 474,914

1 Claim.

This invention relates to extension brackets or extension electricalfixtures of a character to enable one to attach or connect the same to awall receptacle, which may bein a remote or inaccessible location thusmakingv connection to the electric main or source of supply moreaccessible.

An important object of my invention is to provide a device of theaforementioned character which is practical and efficient in itsoperation, neat in appearance and will not require a great deal' offastening equipment toI secure the same removably to a wall bracket, yetof such simple construction that it will lend itself to economicalproduction in quantities.

Other objects, features` and 'advantages resident in my invention willbecome apparent from an examination of the accompanying drawing andtheensuing description, wherein like symbols will denote like parts; andin which;

Fig. 1 is an isometric view showing my invention attached to areceptacle of a wall and showing how it facilitates plugging in anelectrical instrument, such as a lamp which may be on a desk; both the`lamp and desk being shown in phantom, and also indicating how myinvention facilitates connection to what would otherwise be aninaccessible and inconvenient electrical connection.

Fig. 2 is a front elevation of my invention.

Fig. 3 is an end view of the View shown in Figure 2.

Fig. 4 is an enlarged fragmentary view of a slight modification of myinvention.

Fig. 5 is an enlarged fragmentary longitudinal cross-sectional Viewtaken on the line 5-5 of Figure 2.

Fig. 6 is a fragmentary transversal cross-sectional view on the line 6-6of Figure 4.

Fig. '7 is a fragmentary isometric cross-sectional view indicating theclamp means which is used in connection with the modified form indicatedin the structure of Figure 4.

In Figure 1, a wall is, generally, designated I0, which is provided witha receptacle, generally, designated 9, to which my invention, generally,designated 8 may be attached. This wall has its usual base-board ormolding I2, and as can be seen a desk designated I I may be set upagainst the wall in such a position where it would be inconvenient andinaccessible to plug in the lamp cord 22 of the lamp 23 into thereceptacle 9, yet contrarily to disconnect the same would oier the sameinconvenience and inaccessibility. To obviate this difficulty, I haveprovided the'invention characterized by theA enlarged detailed drawings:shown.

In. Figures 2' and 3, I show one form of my irlvention which. iscomprised of a male receptacle I-3,'having the terminals I4', which t orconnect to the Wall socket or receptacle 9 heretofore mentioned. Thesaid male plug element 'I 3 is secured to a connecting pipe or tube I4within which is encased the Wiring I5; the tube I4 being ultimatelyconnected to the top female receptacle 20 having the openings 2| adaptedto receive terminals of connecting plug 24 similar to the terminalsI4'.. The fixture 8 is connected to the inaccessible receptacle and tothe extension tubing I4 which results-iin positioning the femalereceptacle 2li in. a more accessible place, and serves the' purpose ofproviding a live circuit for connecting any electrical instrument.

The fixture. is, preferably, held against the wall by virtue of abracket, generally, designated I6, having. a tapered angular slideportion 25 into which is fitted the securing bracket I'I which issuitably recessed to receive the pipe I4, and is provided with a boss orpad I9 which is threaded to receive the binding or clamping screw I8.This clamping screw may be knurled so that it can be loosened andtightened with the fingers and thus not necessitate the use of anyspecial tools. The bracket I1 is also provided with the tapered slidestructure 26 which ts into the tapered slide-way 25 and thus serves tosecure the bracket to the wall bracket I6, it being secured to the wallby screws or any other fastening not shown in the drawing.

In securing my fixture to a wall, the first thing that is done is tosecure the prongs I 4 or connect the prongs I4 to the receptacle 9. Thebracket I1 is, preferably, held at the top so as to permit positioningthe rear end or the back of the receptacle 20 flush against the wall,then the bracket I'I is slipped downward, the slide portion 26 caused toengage the slide-way 25 until the taper locks the same in `positionwhence the clamping screw I'I is further brought to bear on the pipe I4so as to secure the entire unit firmly and lock it firmly in place.

The modified form indicated in Figures 4, 6 and 'l comprises a bracketwhich has an extension I9 which is somewhat longer than the oneindicated for the form in Figures 2, 3 and 5. The clamping screw I8 in,-this case has a reduced shank portion 34, an enlarged threaded portion35, an abutting end of the threaded portion designated 31, and a reducedshank portion 36 to act as a pilot for the elongated recesses 30 and 29.The said recesses being closed at opposed ends, namely at 32 and at 3I.Thewire 33 is coiled in order to allow for extension and collapsing ofthe said telescopic means 21 and 28.

The tubing I4 in this instance is replaced by the telescopic tubing 21and 28, the bracket being provided to clamp the telescopic tubing inplace by virtue of the clamping screw I8, the shoulder 31 pressing orabutting against the slotted openings of the tubes 2'I and 28 impingingthem against the opposite section of the bracket I'I thus causing themto be locked in place. The tubes may be lengthened to maximum dimensionand the pilot portion 36 of the screw I8 will prevent the telescopictubing from coming apart. The pilot portion is not disengaged from theslotted portion 29 and 3U for the reason that a set screw 38 having areduced shank 39 is positioned so as to limit the outward travel of thescrew I8, thus merely permitting it to travel far enough to release thepressure of the shoulder 31 against locking the tubings in place. Whenthe tubings are adjusted to the proper height, this locking screw istightened.

The attachment of the xture with the teles-:opi arrangement to a wallmay be made in ie same fashion as the fixture represented in es 2 and 3;that being done by engaging terminals Ell' and connecting to thereceptacle S. maintaining the slide Il in an upward position and thenengaging it in the bracket I6 causing the tapered slide 26 to engagefirmly the gudevsay 25. When that is thus secured, the upper receptacle20 may be lifted or lowered to tlie most suitable position within itsadjustable ranm of movement, and the clamping screw I8 The brackets I6are permanently fastened to the walls over such inaccessible outletsindicated by the numeral 9, so that one fixture may be used in severalplaces since it may be readily attached and readily disconnected asheretofore expounded and described.

Altho, I have herein shown a preferred embodiment and disclosed andrevealed preferred embodiments of my invention, and inasmuch as they aresusceptible of many alterations, modi'- fications, and improvements, Ireserve the right to all such modifications, alterations, andimprovements which come within the spirit and scope of the accompanyingdrawing and as well come within the purview of the foregoingdescription; my invention to be limited only by the subjoined claim.

Having thus described and revealed my invention what I claim as new anddesire to secure by Letters Patent is:

In an article of the character described, telescopic conduit meanscomprising, two telescopic members slidably secured to clamping means,the said telescopic members provided with longitudinally coincidentslotted portions closed on opposed ends with respect to their respectiveassemblage, said clamping means comprising, a clamp bracket membersecurable to a wall, clamp screv.v means secured to the said clampbracket member having pilot means operable within the said coincidentslotted portions, check screw means secured to the said clamp bracketmember adapted to limit the movement of the said clamp screw means, amale plug secured to one end of the said telescopic conduit means, afemale receptacle secured to the other end of said telescopic conduitmeans, the said male plug and the said female receptacle being inoppositelyl disposed relationship, andy electrical connecting means ofsufficient length confined within the said telescopic conduit meansconnecting the said male plug to the said female receptacle.

HENRY HARTMANN.

